We turn to our smart phones for everything from news updates to boredom-busting games. But can they help us lose weight? See the best fitness apps that just might get you to shed those pounds fast

RunKeeper, Free Do you decide that you're going to run, yes run, a full three miles -- but end up walking the whole way? That's when a personal trainer yelling at you through a megaphone would come in handy. But if you don't have the funds for a human trainer, why not opt for a digital one? RunKeeper uses the GPS technology in your iPhone to track your fitness activity, giving you comparable results to those expensive GPS watches. The app tracks how far you went, how long it took you, your pace, and how many calories you burned. You can even enter your target pace, and the app will coach you (through your headphones) on whether you're ahead or behind. Genius.

Can't believe they didn't mention MyFitnessPal! Great for tracking calories, setting goals.. Also, if you have any FitBit products, their site is really good. I can't recommend the FitBit Aria scale and FitBit One tracker enough...such good products!